how to disable half inverter circut and baypass protection

[The ENIGMA]

hello gentlemen warm and getting hot greetings from Egypt
there's allot of situations I've no choice but to disable one transformer out of the two that inverter is using
also reduce lamps to 2 out of 4 "1 on top one on bottom of the LCD panel"

the last situation i faced was a burnt inverter board on CCFL connector
"hp la1951g"

inverter board is a single high voltage transformer + 2 connectors'2 pins each' sure for only 2 lamps with no chance to fix the board i had to put an external inverter that uses ordinary 2 transformers + 4 connectors

inverter board make sound and shut after 2 seconds using only one transformer 2 connectors

how can i bypass that and if this question was mentioned before can anyone guide me to a solution

another situation when i have no chance to replace cclf lamps due to measurements
trying to keep inverter board operating with it's half disabled
hope u guys understand what i mean

[budm]

Re: how to disable half inverter circut and baypass protection

So let me get this correctly, you have monitor that only has two lamps and the replacement inverter board is made for 4 lamps operation but you need to make this replacement board work with two lamps, correct?
If that is the case, we will at least see the good clear pictures of this replacement inverter board.
Some people here may suggest you to upgrade it to LED backlights instead.

[stj]

Re: how to disable half inverter circut and baypass protection

yes, led kits are a lot less trouble and very cheap.
http://stores.ebay.com/lcd-led-parts

[The ENIGMA]

Re: how to disable half inverter circut and baypass protection

sorry for the delay
the only chance i have to disable half of the external inverter board
shipping from china is expensive down here
photo is attached

[budm]

Re: how to disable half inverter circut and baypass protection

Great picture, can I see the back side of the board too? I do not see any detection didoes on the board.
Also please give me the P/N of that 16-pin PWM IC so we can look up the spec sheet for it.

[stj]

Re: how to disable half inverter circut and baypass protection

this is handy.
http://monitor.net.ru/forum/topic239071-0.html

[The ENIGMA]

Re: how to disable half inverter circut and baypass protection

Great picture, can I see the back side of the board too? I do not see any detection didoes on the board.
Also please give me the P/N of that 16-pin PWM IC so we can look up the spec sheet for it.

thanks
there's no back for attached inverter totally SMD include DIP capacitors
the PWM IC datasheet available in attachment DF6019A
i'm very fresh in this job

[The ENIGMA]

Re: how to disable half inverter circut and baypass protection

this is handy.
http://monitor.net.ru/forum/topic239071-0.html

yes appreciation to google translate i'm gonna take a deep breath and get into this thread thanks
same exact situation
i have a feeling that this is true i can disable the protection on any board making it continue working

[momaka]

Re: how to disable half inverter circut and baypass protection

sorry for the delay
the only chance i have to disable half of the external inverter board
shipping from china is expensive down here
photo is attached

Funny, I bought the exact same inverter from eBay not too long ago. Still haven't installed it, so I was able to look at it for you

With this inverter...
https://www.badcaps.net/forum/attach...5&d=1434323554
... The left side provides feedback to the DF6109A controller IC, so you cannot disable that. Also, it looks like the primary sides of the two transformers are in series, so it may not be possible to disable the right side. However, it may be possible to just plug 2 lamps in the left side transformer to make the feedback look happy. I don't know, try and see. Connect 2 CCFLs on the left side and none on the right side. If it doesn't work, then the two transformers definitely have their primary sides in series.

[budm]

Re: how to disable half inverter circut and baypass protection

I do not even see any ballast caps on the board.

[stj]

Re: how to disable half inverter circut and baypass protection

that foto makes it look like the transformer need resoldering!
it must be the camera angle.

[momaka]

Re: how to disable half inverter circut and baypass protection

I do not even see any ballast caps on the board.

Do you mean those blue high voltage caps between the CCFLs and the transformer?

There are only 2 on this board. Haven't traced them how they are connected (yet). The CCFLs for the right inverter are connected to ground on one side and the transformer's high voltage outputs on the other.

It's the same for the left inverter, except here the lower CCFL connector provides feedback (CCFL is not connected to ground there).

that foto makes it look like the transformer need resoldering!
it must be the camera angle.

The joints on mine are like that as well. The manufacturer used lead-free solder, but they did a poor job with it. Most big joints look ugly.